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Date:   Thu, 13 Jun 2019 12:13:05 -0700
From:   "Srivatsa S. Bhat" <>
To:     Paolo Valente <>
        linux-block <>,,,
        kernel list <>,
        Jens Axboe <>, Jan Kara <>,
        Jeff Moyer <>, Theodore Ts'o <>,,,,
        Ulf Hansson <>,
        Linus Walleij <>
Subject: Re: CFQ idling kills I/O performance on ext4 with blkio cgroup

On 6/12/19 10:46 PM, Paolo Valente wrote:
>> Il giorno 12 giu 2019, alle ore 00:34, Srivatsa S. Bhat <> ha scritto:
>> Hi Paolo,
> Hi
>> Hope you are doing great!
> Sort of, thanks :)
>> I was wondering if you got a chance to post these patches to LKML for
>> review and inclusion... (No hurry, of course!)
> I'm having troubles testing these new patches on 5.2-rc4.  As it
> happened with the first release candidates for 5.1, the CPU of my test
> machine (Intel Core i7-2760QM@...0GHz) is so slowed down that results
> are heavily distorted with every I/O scheduler.

Oh, that's unfortunate!

> Unfortunately, I'm not competent enough to spot the cause of this
> regression in a feasible amount of time.  I hope it'll go away with
> next release candidates, or I'll test on 5.1.

Sounds good to me!

>> Also, since your fixes address the performance issues in BFQ, do you
>> have any thoughts on whether they can be adapted to CFQ as well, to
>> benefit the older stable kernels that still support CFQ?
> I have implanted my fixes on the existing throughput-boosting
> infrastructure of BFQ.  CFQ doesn't have such an infrastructure.
> If you need I/O control with older kernels, you may want to check my
> version of BFQ for legacy block, named bfq-sq and available in this
> repo:

Great! Thank you for sharing this!
> I'm willing to provide you with any information or help if needed.
Thank you!

VMware Photon OS

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